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                                <section class="normal markdown-section">

                                <h1 id="linear-cartesian-axis">Linear Cartesian Axis</h1>
<p>The linear scale is use to chart numerical data. It can be placed on either the x or y axis. The scatter chart type automatically configures a line chart to use one of these scales for the x axis. As the name suggests, linear interpolation is used to determine where a value lies on the axis.</p>
<h2 id="tick-configuration-options">Tick Configuration Options</h2>
<p>The following options are provided by the linear scale. They are all located in the <code>ticks</code> sub options. These options extend the <a href="./#tick-configuration">common tick configuration</a>.</p>
<table>
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Default</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>beginAtZero</code></td>
<td><code>Boolean</code></td>
<td></td>
<td>if true, scale will include 0 if it is not already included.</td>
</tr>
<tr>
<td><code>min</code></td>
<td><code>Number</code></td>
<td></td>
<td>User defined minimum number for the scale, overrides minimum value from data. <a href="#axis-range-settings">more...</a></td>
</tr>
<tr>
<td><code>max</code></td>
<td><code>Number</code></td>
<td></td>
<td>User defined maximum number for the scale, overrides maximum value from data. <a href="#axis-range-settings">more...</a></td>
</tr>
<tr>
<td><code>maxTicksLimit</code></td>
<td><code>Number</code></td>
<td><code>11</code></td>
<td>Maximum number of ticks and gridlines to show.</td>
</tr>
<tr>
<td><code>stepSize</code></td>
<td><code>Number</code></td>
<td></td>
<td>User defined fixed step size for the scale. <a href="#step-size">more...</a></td>
</tr>
<tr>
<td><code>suggestedMax</code></td>
<td><code>Number</code></td>
<td></td>
<td>Adjustment used when calculating the maximum data value. <a href="#axis-range-settings">more...</a></td>
</tr>
<tr>
<td><code>suggestedMin</code></td>
<td><code>Number</code></td>
<td></td>
<td>Adjustment used when calculating the minimum data value. <a href="#axis-range-settings">more...</a></td>
</tr>
</tbody>
</table>
<h2 id="axis-range-settings">Axis Range Settings</h2>
<p>Given the number of axis range settings, it is important to understand how they all interact with each other.</p>
<p>The <code>suggestedMax</code> and <code>suggestedMin</code> settings only change the data values that are used to scale the axis. These are useful for extending the range of the axis while maintaing the auto fit behaviour.</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">let</span> minDataValue = <span class="hljs-built_in">Math</span>.min(mostNegativeValue, options.ticks.suggestedMin);
<span class="hljs-keyword">let</span> maxDataValue = <span class="hljs-built_in">Math</span>.max(mostPositiveValue, options.ticks.suggestedMax);
</code></pre>
<p>In this example, the largest positive value is 50, but the data maximum is expanded out to 100. However, because the lowest data value is below the <code>suggestedMin</code> setting, it is ignored.</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">let</span> chart = <span class="hljs-keyword">new</span> Chart(ctx, {
    type: <span class="hljs-string">&apos;line&apos;</span>,
    data: {
        datasets: [{
            label: <span class="hljs-string">&apos;First dataset&apos;</span>,
            data: [<span class="hljs-number">0</span>, <span class="hljs-number">20</span>, <span class="hljs-number">40</span>, <span class="hljs-number">50</span>]
        }],
        labels: [<span class="hljs-string">&apos;January&apos;</span>, <span class="hljs-string">&apos;February&apos;</span>, <span class="hljs-string">&apos;March&apos;</span>, <span class="hljs-string">&apos;April&apos;</span>]
    },
    options: {
        scales: {
            yAxes: [{
                ticks: {
                    suggestedMin: <span class="hljs-number">50</span>
                    suggestedMax: <span class="hljs-number">100</span>
                }
            }]
        }
    }
});
</code></pre>
<p>In contrast to the <code>suggested*</code> settings, the <code>min</code> and <code>max</code> settings set explicit ends to the axes. When these are set, some data points may not be visible.</p>
<h2 id="step-size">Step Size</h2>
<p> If set, the scale ticks will be enumerated by multiple of stepSize, having one tick per increment. If not set, the ticks are labeled automatically using the nice numbers algorithm.</p>
<p>This example sets up a chart with a y axis that creates ticks at <code>0, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5</code>.</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">let</span> options = {
    scales: {
        yAxes: [{
            ticks: {
                max: <span class="hljs-number">5</span>,
                min: <span class="hljs-number">0</span>,
                stepSize: <span class="hljs-number">0.5</span>
            }
        }]
    }
};
</code></pre>


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